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Using stock notation, represent the following compounds:

(a) Fe2O3 =

(b) CuO =

(c) MnO = 

 (d) MnO2

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(a) Fe2O3 =  Fe2(III)O3 

(b) CuO =  Cu(II) 

(c) MnO =  Mn(II)O 

(d) MnO2 =  Mn(IV)O2

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